Comparative F1-score Analysis of OpenPangu-7B-MLA on EchoMind Under Varying Contamination Rates and Bias Correction Strategies

Abstract

Abstract: Anomaly detection is a widely explored domain in machine learning. Many models are proposed in the literature, and compared through different metrics measured on various datasets. The most popular metrics used to compare performances are F1-score, AUC and AVPR. In this paper, we show that F1-score and AVPR are highly sensitive to the contamination rate. One consequence is that it is possible to artificially increase their values by modifying the train-test split procedure. This leads to misleading comparisons between algorithms in the literature, especially when the evaluation protocol is not

Research Question

How does the F1-score of OpenPangu-7B-MLA compare to other multilingual prosody-aware models on EchoMind under varying contamination rates, and what bias correction methods can be applied to mitigate evaluation skew?

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